In this intercourse position, the girl leans back with her legs apart. The guy kneels between her legs. She tilts her pelvis upward, so that her back forms a straight line pointing up towards him while the crotches meet.
This position only works well if the girl lines up correctly with the guy.
He can hoist her butt up with his hands, so that her pelvis stays tilted upward while he thrusts. She could also put her legs on his shoulders to make the position more comfortable.
The Butterfly can also be done while she lies on a table, with her vulva on the edge, while he stands in front of her. The table should be a little lower (about a foot) than his pelvis.
She has her hands free to stimulate the clitoris and could easily use a vibrator.
It’s a very good position for stimulating the G-spot, because of the tilted position. By changing the angle of her pelvis she can adjust the position of his penis at will.
The glans is strongly stimulated.